This is a pretty old, sorry I didn't see it sooner. I ride the Manhattan Bridge and Williamsburg Bridge all the time without issue. NEVER EVER ride the Brooklyn Bridge. It is so crowded that you slow to a crawl and have to stop constantly. I made that mistake once and ended up getting hit in the face with a selfie stick. The Manhattan is always empty. It's fairly straightforward. You just have to slow down a little for the plates in the middle of the bridge and you do get a little sore maintaining the same slow upward angle for half the time.